Pumping mechanism



Nov. 13, 1928.

W. B. VAN ARSDEL PUMPING MECHANISM Fild May 13, 1925 2 Sheets-Sheet 1 W. B. VAN ARSDEL PUMPING MECHANI SM 2 Sheets-Sheet 2 W dia y Nov. 13, 1928.

Patented Nov. 13, 1928.

UNITED stares learnt.

are r; o ric E.

WALLACE B. VAN AREDEL, OF BERLEN, NEXV HAIVIPSHIRE, ASSIGNOB TO BROWN GOM IEQKNY, OF BERLIN, NEW HAMPSHIRE, A CORPORATION OF MAINE. V

romriive- MECHANISM.

Application filed May 13,- 1925 Serial No. 29,895.

This invention relates tofeeding and vaporizing apparatus, and has for one of its objects to provide an apparatus by means of which molten sulphur or similar material may be pumped in uniform and measured quantity, variable at will, to a vaporizing furnace wherein the sulphur vapor may be continuously vaporized, and then used, as for example, in the production of carbon bisulphide, as fully described in a companion application, Serial Number 37,612, filed June 17, 1925, by Paul Brown.

In carrying out the afore-mentioned object, this invention provides a pump construction which obviates the use of sensitive and troublesome parts, such as springs, piston rings, check valves, stuffing boxes, and materials such as leather or rubber, which are reacted upon by the molten sulphur or especially corrosive impurities contained in the sulphur, such as the sulphur chlorides, thus reducing to a minimum pump troubles, and the possibility of the pump being); disabled;

.The invention further provides an'easily accessible arrangement of the various pump parts, so that replacement thereof maybe made easily and quickly when they have become worn out owing to corrosion or wear. Other features of invention and advantages ,incident thereto will appear as the description proceeds; I r 7 On the accompanying drawings, which are somewhat conventional and diaarammatimj Figure 1 represents a front view, partly in section, of a pump unit constructed in accord- V "dotted line position cutting off the flow of ,sul

ance with this invention. r l 1 v Figures2 and 3' are sections taken respectively'on the lines 2+2 and 3-3 of Figure 1', looking to the left of the figure;

Figure 4 represents a plan view of the unit..-

7 Figures 5 and 6 are sections taken'respectively on the lines 5-5 and 66 of Figure 4, looking, in the direction of the arrows. J 1

Figure 7 illustrates an arrangement of the entire apparatus. r r

Referring to the drawings, 1 represents the body portion of the pump, which consists of a single casting of iron or steel, in the form of a rectangular block which may be rigidly secured to a suitable support by su1tabl'efas tening means, as bolts, through the lug, portions 13, 13 on its sides. Cylindrical: holes 2 and 3, s aced from each other alou the trans- Y verse center line 5+5, are'bored vertically through the block,the lower end of the hole 3 being closed by a plug 7, and the'lower'end hole 2 connected toan outletsteam j acketed 1 pipe 8.; Both holes are accurately ground" and finished,"the hole 8 constituting, a pis- 9 ton chamber, and the hole 2 a valvechamber.

A horizontal hole'9, constituting the sulphur phur supplysource by a steam jacketed con:

inlet, is bored inwardly fromv the valve end of the lower portion of the block to the valve chamber 2, and is connected to the liquid sulduit 4. Another hole 5' is bored inwardly from the opposite end on a somewhat lower level, to the valve chamber 2, and constitutes a port between the two chambers, -Adapted to be reciprocated within the chamber 3 is the pump piston or plunger'G, which is accurately machined to make a good sliding fit therein, without the use of piston rings or a stufling box. Similarly disposed within the chamber 2'is a plunger slide valve 10,'near the lower end of which an annular portion has been cut away, forming what may short stub portion l2 of fullicross'section and of suliicient length to occupy the chamber termed a stem portion 11, and leaving a,

space 2 between the two horizontal openings 9 and, 5. v

Thesuction stroke of the piston 6 takes place on its upward travel, with the valvelOn resting at its lowest position asindicatedby' flowing in around thev valve stem and through the. port/5 into the piston chamber 3. ,Near the, completion 'ofthe suctionistroke the valve, isiquickly lifted toa position shown bvfitsl phur to the chamber 3, and is, allowedto-ree main there whilethe downward or'pressure j stroke of the piston takes place',-the sulphur.

Q5 its full lineposition (Figure 5) sulphur downward stroke, tlie'valve is quickly low-,. V

operations is repeated. Both the valve 10 and the piston 6 are, of. course, power-driven, and are actuated respectively by a cam 20 and a split sheave eccentric 21, fixed to a common driving shaft 15, directly above the pump block 1.The shaft 15 is ered to its lowest position, and the cycle of I iournaled in the bearings 16, 16, which are,

supported by the uprights 17, 17, 'Ijhe eccentric 21 imparts a reciprocating motion to the piston 6, through the connecting rod 22, PlY

otally connected to the piston by a pin 23. Similarly, the cam 20 actuates the valve through cam rollers 28 and 29, mounted on the studs-32 and 33 Carried by an LJ-shaped cam arm, adjustably connected to the valve 10. The adjustable connection is made through a stud 19, extending through the horizontal portion of the arm 30 and positioned between a pair of fixin nuts 37 and 38. By raising or lowering the valve phur, the shaft 15 isdriven by a suitable variable speed mechanism. The variable. speed mechanism, as shown, comprises a ratchet wheel 40, fixed to the driving shaft 15, and actuated by a pawl 41 carried'by a rock arm 42, mounted loosely on the shaft 15 and having anelongated slot portion 43. Motion is imparted to the shaft 15 from a crank drive shaft 50, which may be power-driven from a.

motor (not shown) ,through a crank 45 and a connecting rod 46 which engages the arm 42 by a wrist pin 48, carrying a positioning or fixing member 49 slidably mounted in the slotted portion 43. By sliding the member 49 up or down, the pawl may be made to pick up more or fewer teeth on the ratchet wheel,the speed of the pump shaft, and hence the delivery of sulphur, thus being increased or de creased. l I

- In order to maintain the sulphur in liquid f condition and prevent the depositionof any the holes being plugged by plugs 81.,

solid sulphur in the pump, provision is made to maintainthe sulphur in its molten condition by heating it while, it is being pumped. To accomplish this result, the pump is steam jacketed as follows; A plurality of holes are bored vertically through the block on bothv sides of the center linev 55, both ends of and two holes are bored horizontally on each side throughthe block,one hole 84 joining the upper portions ofthe vertical holes 80, and the other the lower portions. Thealternate ends of the holesare'plugged by the plugs '88,' the top hole 84 serving as a steam inlet manifold,steam entering at one end through the steam pipe 86, and the bottom hole 85 as an outlet manifold,-the steam leaving at the opposite end through the steam pipe 87. The

block may also be lagged with a heat insulating material such as magnesia asbestos, if desired.

In Figure 7 is illustrated apparatus foruse with which the pump embodying the invention is particularly adapted. Such apparatus as illustrated consists of a sulphur melting pot 89 and a sulphur vaporizing furnace 95, both screened outlet 94; at its bottom portion, and

communicates with the pump inlet by, the steam jacketed conduit 4, valved as at he sulphur passes from the pump outlet steam jacketed conduit 8 to the vaporizing furnace 95. The furnace comprises a shallow vaporizing muffle 96, supported at the upper portion of the furnace, directly over the fire bed, by'the furnace walls 97. Exterior to the furnace structure on a slightly higher level than muflle 96, is asteam-jacketed open reser: voir 98, into which the molten sulphur from the pump is delivered. An inverted L-shaped delivery pipe 99 communicating with the muf fle96extends through a side portion of the reservoir 98 into the molten sulphur, the sulphur tending. to risebeyond the level of the horizontalportion of the pipe 99 being delivered into the mufile. This type of delivery acts as a vapor seal, preventing'any sulphur The sulphur vapor formed in the muflle is con ducted therefrom through its side portion 102 into a conduit, 101. Itwillbe obvious that, while I have described a single-acting pump unit having a somewhat intermittent sulphur delivery to the reservoir 98, the same features of invention could be applied equally'as well to a plurality of such units relatively timed to give a more uniform fluid flow.

At the risk of repetition, it may again be stated that the drawings are diagrammatic, no attempt having been made to show the true size relation between the various instrumentalities or their spacial relation 'to'one another. I For the sake of'clarity in'the draw-- ings, unnecessary detailsof construction such as pipe-lagging and pipe-steam jackets have been omitted, but it is understood that these will be supplied where necessary. It will of only, and this invention 'is susceptible of Va "rious changes and modifications which are within its spirit and scope as define-d by the ap ended claims WhatI claim is i 1 1. Apparatus for pumping hot fluid, com prising a block having bores'therein' disposed in a plurality of substantiallyparallel planes, means associated with theboresin one of said planes actuable topump fluid supplied thereto,- and means for plugging all but two of the surface openings of the bores in each of the remaining planes, the unplugged openings being available as inlet and outlet ports for heating fluid. V 2; Apparatus for pumping hot fluid, comprising a block having'bores therein disposed in a plurality of substantially parallel planes,

planes actuable to pump fluid supplied thereto the bores in each of the other said planes zomprising a plurality of closely spaced parallel bores extending through the block and a pair of widely spaced bores transversely intersecting said parallel bores, and means, for plugging all but tWo of the surface openings of the bores in each of said other plane, the unplugged openings being at points in diagonally opposite portions of the block.

3. Apparatus for pumping hot fluid, comprising a block having bores therein disposed in a plurality of substantially parallel planes, the bores in'one of said planes including a pair of parallel bores connected by a transverse bore, the bores in each of the other said planes being interconnected and having an inlet and an outlet port for the circulation of heating fluid, one of said parallel bores be ing closed at one end, a piston slidably fitted for reciprocationvin said one bore, the other said parallel bore having an exhaust port communicating with one end thereof and an inlet port opening thereinto at a point spaced from the point of connection with said'trans- ,2

verse bore, a valve member slidably fitted in said other parallel bore and movable therein from and to positions between the inlet port and the transverse bore and between the transverse bore andthe outlet port, and means for 0 reciprocating said piston and valve member. In testimony whereof I have aflixed my signature.

WALLACE B. VAN ARSDEL. 

